Determination of optimal degree days of fasting before slaughter in rainbow trout (Oncorhynchus mykiss)

Bermejo-Poza, Rubén; Fuente, Jesús de la; Pérez, Concepción; González de Chavarri, Elisabet; Teresa Díaz, María; Torrent Bravo, Fernando y Villarroel Robinson, Morris Ricardo (2017). Determination of optimal degree days of fasting before slaughter in rainbow trout (Oncorhynchus mykiss). "Aquaculture", v. 473 ; pp. 272-277. ISSN 0044-8486. https://doi.org/10.1016/j.aquaculture.2017.01.036.

Descripción

Título: Determination of optimal degree days of fasting before slaughter in rainbow trout (Oncorhynchus mykiss)
Autor/es:
  • Bermejo-Poza, Rubén
  • Fuente, Jesús de la
  • Pérez, Concepción
  • González de Chavarri, Elisabet
  • Teresa Díaz, María
  • Torrent Bravo, Fernando
  • Villarroel Robinson, Morris Ricardo
Tipo de Documento: Artículo
Título de Revista/Publicación: Aquaculture
Fecha: 2017
Volumen: 473
Materias:
Palabras Clave Informales: Food deprivation, Water temperatura, Rainbow trout ,Cortisol, pH
Escuela: E.U.I.T. Forestal (UPM) [antigua denominación]
Departamento: Ingeniería y Gestión Forestal y Ambiental
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Pre-slaughter fasting is a common practice in aquaculture to ensure emptying of the digestive tract, but little is known about how long fish should be fasted, in terms of degree days (°C d), to clear the gut without affecting their welfare or flesh quality. In this study, 180 rainbow trout (Oncorhynchus mykiss) were fasted for 3, 4, 5, 6, 7 and 9 days (17.2, 22.3, 28.6, 35.3, 41.8 and 55.3 °C d, respectively) and different morphometric, hematological and flesh quality parameters were measured. The slaughter weight, relative growth and hepato-somatic index did not decrease until after 7 days of fasting (41.8 °C d) and stomach content was similar and near zero after 4 days of fasting (22.3 °C d). Conversely, fasting time increased carcass yield. Plasma concentrations of cortisol, glucose and creatine phosphokinase enzyme were lower with increasing days of fasting. However, trout slaughtered after 5 days of fasting (28.6 °C d) had a higher flesh pH at 0 hours post-mortem than 3 and 4 days fasted trout and, consequently, earlier establishment of rigor mortis. Furthermore, liver color could be useful as a stress indicator since its hue decreases after 5 days of fasting (28.6 °C d). In conclusion, a pre-slaughter fasting period from 17.2 ° C d to 22.3 ° C d makes possible to obtain a complete emptying of the digestive system in rainbow trout and simultaneously it can minimize the stress response with consequent better flesh quality.

Más información

ID de Registro: 50497
Identificador DC: http://oa.upm.es/50497/
Identificador OAI: oai:oa.upm.es:50497
Identificador DOI: 10.1016/j.aquaculture.2017.01.036
Depositado por: Memoria Investigacion
Depositado el: 04 May 2018 09:01
Ultima Modificación: 04 May 2018 11:39
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